Java ArrayList Iterator Function
What is an ArrayList?
Arraylist is a part of collection framework in java. we can perform several inbuilt functions of different classes of collection. The iterator function of java.util.Iterator Package can be used to iterate over the ArrayList in Java.
It implements the List interface of the collections framework.
Here, in the page we will discuss about the Iterator Method in java. To know more about ArrayList in java, you can click on the button given below.
ArrayList Iterator Function:
Java Collection contains several inbuilt functions that are used to perform several operations on ArrayList. The Iterator function is an inbuilt method of class Iterator.
The Java ArrayList Iterator function helps to iterate over the ArrayList. It returns an iterator over the elements in this list.
Syntax:
arraylist_name.iterator()
Definition of Parameters:
Return Type :
clear() Function in ArrayList
clone() Function in ArrayList
add() Function in ArrayList
addall() Function in ArrayList
Example for Iterating over the elements of ArrayList of Integers:
import java.util.*;
public class Main{
public static void main(String[] args){
ArrayList<Integer> Prep = new ArrayList<>();
Prep.add(10);
Prep.add(20);
Prep.add(30);
Prep.add(40);
System.out.println("ArrayList Prep : " + Prep);
Iterator<Integer> Insta = Prep.iterator();
System.out.print("The Iterator Values in ArrayList are : ");
while(Insta.hasNext()){
System.out.print(Insta.next() + " ");
}
}
}
Output: ArrayList Prep : [10, 20, 30, 40] The Iterator Values in ArrayList are : 10 20 30 40
In the above Example, We had taken an ArrayList “Prep” and an Iterator named “Insta” of integer type, we are iterating over the elements of the ArrayList “Prep” with the help of the Iterator and functions like:
- hasNext() : This function helps to tell the compiler whether the next element of the ArrayList is available or not.
- next() : This function is used to move to the next element of the ArrayList.
Example for Iterating over the elements of ArrayList of Strings:
import java.util.*;
public class Main{
public static void main(String[] args){
ArrayList<String> Prep = new ArrayList<>();
Prep.add("We");
Prep.add("Are");
Prep.add("Prepsters");
System.out.println("ArrayList Prep : " + Prep);
Iterator<String> Insta = Prep.iterator();
System.out.print("The Iterator Values in ArrayList are : ");
while(Insta.hasNext()){
System.out.print(Insta.next() + " ");
}
}
}
Output: ArrayList Prep : [We, Are, Prepsters] The Iterator Values in ArrayList are : We Are Prepsters
In the above Example. we have created an ArrayLists “Prep” and an Iterator “Insta” of String Type, we are iterating over the ArrayList “Prep” with the help of iterator functions in the loop and iterator “Insta”.
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